Gasoline hammer



Feb. 10, 1953 Filed Jan. 3, 1950 G. A. CARLSON 2,627,849

GKSOLINE HAMMER 2 SHEETSSHEET l Illi- III Goodwin A. Car/son INVENTOR.

Feb. 10, 1953 G. A. CARLSON 2,627,849

. GASOLINE HAMMER Filed Jan. 3, 1950 2 SHEETS-SHEET 2 7? B 48 44 I6 I 66 46 74 58 52 5; 5 ,i r64 ,4 60 g 62 66 Goodwin A. Car/son INVENTOR.

Patented Feb. 10, 1953 UNITED STATES PATENT T'OFF'ICE GASOLINE HAMMER Goodwin A. Carlson, Slayton, Minn. Application January 3, 1950, Serial No. 136,516

Claims. 1

This invention relates to percussive apparatus, such as rock drills, automatic hammers, and like impact-producing mechanisms, and more particularly to such percussive tools wherein the means for imparting impact employs an internal combustion engine.

An object of this invention is to provide means for producing a controlled vertical vibration in the gasoline hammer to enable a tool such as bits,

spades, and tampersto properly engage and work on the desired surface.

It has been recognized for a considerable period of time that rock drills and like tools which require compressed air for their motive power are not suitable for prospectors and for use in places where compressed air is not readily available.

It is therefore a further object of the invention I to provide a percussive tool which is powered by a prime mover using gasoline as a fuel.

Yet another object of the invention is to provide a percussive apparatus that is sufiiciently light in weight for easy transportation from one location to another.

Still further objects reside in the provision of a gasoline hammer that is strong, durable, highly eficient in operation, simple in construction and design, and inexpensive to manufacture.

The invention, briefly described, comprises a housing to which is preferably secured a two-cycle gasoline engine, the said engine driving a drive shaft on which there is secured a first unbalanced flywheel. A second unbalanced flywheel is journaled on the drive shaft. A first bevel gear is securedto the drive shaft and a second bevel gear is secured to the second flywheel. An idler bevel gear engages the first and second bevel gears to impart a rotation to the second flywheel in a direction opposed to the direction of rotation of the first flywheel. This will cause a controlled vertical vibration for the housing. A suitable tool, such as a spade or bit, need but be secured to the housing. The vertical vibration of the gasoline hammer, when held by a resiliently mounted handle, will be such as to provide a reliable and eificient impact or percussive tool.

The aforesaid objects, together with the various ancillary objects of the invention which will become apparent as the following description proceeds, are attained by this gasoline hammer, a preferred embodiment of which has been illustrated in the accompanying drawings, by way of example only, wherein:

Figure 6 is a perspective view of thetwo flywheels.

With continuing reference to the accompanying drawings wherein like reference numerals-designate similar parts throughout the various views, reference numeral l0 generally designates the gasoline hammer. comprising the present invention. The gasoline hammer It! comprises a casing i2 to which .is bolted or otherwise secured a crankcase [4 on which is mounted a prime mover [6 which preferably comprises a two-cycle gasoline engine. Atool bit I8 is adapted to .be secured to the casing l 2 by spring clamps 20. The tool bit I8 may be a spade, bit, tamper or the like, and such are readily available commercially for use in other gasoline or compressed air percussive tools.

. As shown in Figure 3, the casing I2 is formed with an upwardly extending, externally threaded hollow cylindrical projection 22 on which is threadingly engaged a collar 24.; Within the cylindrical projection 22 is formed an additional cylindrical projection 26. Slidably embracing the collar 24 is a tubular portion 28 of a-handle 30 which has a downwardly extending shaft 32 slidably positioned through collar 24. An annular flange 34 is formed on the shaft 32 and a piston pin 36 is engageablewithin cylindrical projection 25. A-spring 38 is provided to bias the flange 34 and the collar 24 while spring 40 biases thehous- =ing l2 and the collar-34. Thus, there is'provided Figure 1 is a side elevational view of the gasa handle resiliently mounted on the housing 12. Secured to the casing I2 and resiliently-supported thereon is a fuel tank 42 which is held to the casing 12 by brackets 44. The fuel tank 42 is cushioned by resilient mat 46. v The piston 48 of the prime mover It; drives piston rod 50 which is connected'to a crank shaft 52 which, in-turn, drives the drive shaft 54 of the gasoline hammer. A crankcase'cover isbolted to the crankcase l4 and is generally indicated by reference numeral 55. In this manner, the connection between the piston rod 5ll'and the crank pin 58 and the crank rod 52 may be readily inspected and repaired if necessary.

Pinned'to the drive'shaft 54 is a-flrst'unbalanced flywheel 60. The flywheel 60 is provided with an eccentrically mounted weight 62. ,A second flywheel 64 freely rotatable about the shaft 54 is provided with an eccentricallymounted weight 65 to unbalance'the flywheel 64.

Rigidly secured to the shaft 54 is a first bevel gear 68. A second bevel gear I0 is secured-to the flywheel 64 and is rotatable about the shaft 54. An idler bevel gear 12 engages the bevel gears 68 and 10 in orderto rotate the flywheel-64 in a direction opposed to the direction of rotation of the shaft 54.

As shown best in Figure 5, the unbalanced flywheels 60 and 64 have been schematically illustrated at the different stages of each revolution of the shaft 54. In position A, the flywheels are shown with the weights 62 and 66 at the top, resulting in unbalance. As shown in B, the weights 52 and 66 balance each other to'provide horizontal balance; as shown inC,"'the flywheels are again in vertical unbalance with the weights 62. and 66 at the bottom of the rotation. At position D, the wheels are again in-balance with the weight 62 balancing the weight 66. Accordingly, the effect of the flywheel rotation will be a minimum horizontal vibrationran'dia'maximum controlled vertical vibration parallel to the longitudinal or verticaleaxis of the machine and transmittedthrough the device to the surface en- 'gage'd'bythe bit for drilling or digging thereof. The shaft 54 extends without the housing Hand is journaled in the housing by suitable roller or ball'bearings'l l. Rigidly attached to the-outer- "mostiend of the'shaift 5.4'is a pulley-wheel i6 "wheelflfifthe 'bevel gear 68 isrotated; thus im 1 parting"rotation upon the idler gear 72. Rotat- Ting with the idlergear'n is'a shaft 78 which is 'connec'ted'to'a magneto -60 *of conventional design. The magneto 8B is connected to thesparkplug '82 or sparkplugs,depending-upon the size of the engine [6. In this manner. byrotation ofthe-pulley wheel HS/the shaft 1'8 actuates a magneto -80 to provide starting current through the sparkplug 82 to start the prime mover i6.

Since from the foregoing, the construction and advantages of "this 'gasolinehammer are readily apparent, "further "description is believed to be unnecessary.

However, since num rous modifications will readily occur'to thoseskilled in the art after a consideration of the fo egoingspecification and accom anying drawings. it is not intended to 'limitthe invention to 'theprecise embod ment shown and describedQbut all suitable modifications and equivalents of this gasoline'hammer may be-resortedto which-fallwithin the scope toftheappende'd claims.

j Havlng "described the invention, what is claimed 'as'new is:

1..=A gasoline hammer comprising a housing having a "drive shaft 'rotatably journaled therein,"a reciprocating type prime mover'operatively connected to said driveshaft for effecting rotation-of said shaft, a first unbalanced flywheel rigidly secured to said shaft, a second unbalanced flywheel'rotatably secured on said shaft, means :secured to said shaft and said second flywheel selectively rotating said second flywheel in an oppositedirection to the normal rotation of said first 'fiywheeL-said housing adapted to have a tool "secured thereto and extending downwardly therefrom.

*2. Ina gasoline hammer; the'corribinationwith a reciprocating type prime mover of means to impart 'a controlled vertical vibration "to said .lgasoline' hammer,- said means comprising a 'drive :shaft, connecting and crank rods interconnecting saidreciprocating' type prime mover with said driveshaft for effecting rotation thereof, a first -unbalanced flywheel rigidly secured to said-shaft, a second unbalanced flywheel rotatably secured Jon said'shaft an'd means'securedto said shaft andsaidsecondflywheel selectively rotating said *second flywheel in an opposite direction to the normal rotation of said first flywheel.

1",."In a gasoline hammen'an internal combustion' engine-having a reciprocating piston, means imparting-a controlled vertical vibration to said 'gasolinehammer, said means .comprising. a drive .shaft, connecting andcrank rods interconnect- Iingsaid piston and drive. shaftforefiectingrotawheel rotatably secured on said shaft, and means selectively rotating said second flywheel in an opposite direction to the normal rotation of said first flywheel and said shaft, said last recited .means comprisinga first bevel gear secured to said shaft, a second bevel gear secured to said second "flywheel, and an idler bevel gear engaging said first and second bevel gears.

4. A gasoline 'hammer comprising 'a housing having .an internal combustion-engine and drive shaft supported thereby, said internal combustion engine having a reciprocating piston disposedon a vertical :axis, :and said drive shaft being rotatably journaled in said'housing and lying along an axis perpendicular to said vertical =axis, connecting and-crank rods, interconnecting said piston and drive shaft for effecting rotation thereof, andxmeans-mounted on said drive shaft for imparting a controlled vertical vibration'in supplement to the vibration ;efiected' by said reciprocating -piston,:said lastenamed means including a'first unbalanced flywheel rigidly secured'to'saidshaft for rotation therewith,.a'second unbalanced "flywheel rotatably secured on said shaft, means secured to said'shaft and connected to said second. flywheel for selectively rotating saidsecond flywheel inJadirection-opposite to thedirection.of-rotation'ofisaid first flywheel.

5. A gasoline hammer comprising :a :housing having an internal combustion engine and drive shaft supported thereby,-said internal combustion engine having a reciprocating piston disposed on a verticalaxis, and said drive shaft being rotatably journaled in saidhousing and lying along an axis;pe 1 pendicular :toisaid verticalxaxis,

connecting and prank rods interconnecting said piston :and :drive shaft ,for effecting :irotation thereof, 5 and; means, mounted :on said driveshaft -for imparting a controlled vertical vibration in esllppiement to the vibration effected by .said tre- ,.cipro.cating piston, said last-named -means including a first unbalanced flywhee1;rigidly:secured ,to said .shaft for rotation therewith, a

.second unbalanced fly-wheel rota-tably secured-on said shaft, means secured to said shaft and con- .nected to said second flywheel for selectively r0- tating said second flywheel in a direction opposite tothedirection of rotation of said first flywheel, and saidlast included means comprising a first bevelgear secured to said shaft, a second bevel gear. secured to said second flywheel, and an idler .bevel ,gear engaging said first-and second bevel gears for effecting. relative rotation.

GOODWIN A. CARLSON.

REFERENCES CITED The following references are of record in-the file of this patent:

UNITED STATES .PATENTS 

